This is the ANT-18 12FG Transmitter Antenna by Futaba. *ONLY FOR Futaba 12FG* FEATURES: Metal construction Silver in color Female threaded section inside antenna base INCLUDES: One Antenna REQUIRES: Installation on radio SPECS: Length: 6.18" (157mm) compressed Diameter: .39" (10mm) tlw 10/2/07 ir/jxs